#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System.Threading;
using System;

namespace JHSoft.Util.Threading
{
  public sealed class CancelableAsyncResult : IAsyncResult
  {
    private IAsyncResult _result;

    private ManualResetEvent _cancelSignal;
    private bool _canceling;

    internal IAsyncResult Result
    {
      get { return _result; }
      set { _result = value; }
    }

    internal ManualResetEvent CancelSignal
    {
      get { return _cancelSignal; }
    }

    internal bool Canceling
    {
      get { return _canceling; }
    }

    public CancelableAsyncResult()
    {
      _cancelSignal = new ManualResetEvent(false);
    }

    ~CancelableAsyncResult()
    {
      _cancelSignal.Close();
    }

    public void Cancel()
    {
      _canceling = true;
      _cancelSignal.Set();
    }

    public object AsyncState
    {
      get { return _result.AsyncState; }
    }

    public WaitHandle AsyncWaitHandle
    {
      get { return _result.AsyncWaitHandle; }
    }

    public bool CompletedSynchronously
    {
      get { return _result.CompletedSynchronously; }
    }

    public bool IsCompleted
    {
      get { return _result.IsCompleted; }
    }
  }
}